My.cnf

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Bob（讨论 | 贡献）2020年4月8日 (三) 09:31的版本
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[client] port = 3306

  1. 根据实际情况调整mysql.sock配置

socket = /tmp/mysql.sock [mysqld]

  1. Mysql服务的唯一编号 每个mysql服务Id需唯一

server-id = 1

  1. 服务端口号 默认3306

port = 3306

  1. mysql安装根目录

basedir = /usr/local/mysql

  1. mysql数据文件所在位置

datadir = /usr/local/mysql/data

  1. pid

pid-file = /usr/local/mysql/mysql.pid

  1. 设置socke文件所在目录

socket = /tmp/mysql.sock

  1. 设置临时目录

tmpdir = /tmp

  1. 用户

user = mysql

  1. 允许访问的IP网段

bind-address = 0.0.0.0

  1. 跳过密码登录
  2. skip-grant-tables
  3. 主要用于MyISAM存储引擎,如果多台服务器连接一个数据库则建议注释下面内容

skip-external-locking

  1. 只能用IP地址检查客户端的登录，不用主机名

skip_name_resolve = 1

  1. 事务隔离级别，默认为可重复读，mysql默认可重复读级别（此级别下可能参数很多间隙锁，影响性能）

transaction_isolation = READ-COMMITTED

  1. 数据库默认字符集,主流字符集支持一些特殊表情符号（特殊表情符占用4个字节）

character-set-server = utf8mb4

  1. 数据库字符集对应一些排序等规则，注意要和character-set-server对应

collation-server = utf8mb4_general_ci

  1. 设置client连接mysql时的字符集,防止乱码

init_connect='SET NAMES utf8mb4'

  1. 是否对sql语句大小写敏感，1表示不敏感

lower_case_table_names = 1

  1. 最大连接数

max_connections = 400

  1. 最大错误连接数

max_connect_errors = 1000

  1. TIMESTAMP如果没有显示声明NOT NULL，允许NULL值

explicit_defaults_for_timestamp = true

  1. SQL数据包发送的大小，如果有BLOB对象建议修改成1G

max_allowed_packet = 128M

  1. MySQL连接闲置超过一定时间后(单位：秒)将会被强行关闭
  2. MySQL默认的wait_timeout 值为8个小时, interactive_timeout参数需要同时配置才能生效

interactive_timeout = 1800 wait_timeout = 1800

  1. 内部内存临时表的最大值 ，设置成128M。
  2. 比如大数据量的group by ,order by时可能用到临时表，
  3. 超过了这个值将写入磁盘，系统IO压力增大

tmp_table_size = 134217728 max_heap_table_size = 134217728

  1. 禁用mysql的缓存查询结果集功能
  2. 后期根据业务情况测试决定是否开启
  3. 大部分情况下关闭下面两项

query_cache_size = 0 query_cache_type = 0

  1. 数据库错误日志文件

log_error = error.log

  1. 慢查询sql日志设置

slow_query_log = 1 slow_query_log_file = slow.log

  1. 检查未使用到索引的sql

log_queries_not_using_indexes = 1

  1. 针对log_queries_not_using_indexes开启后，记录慢sql的频次、每分钟记录的条数

log_throttle_queries_not_using_indexes = 5

  1. 作为从库时生效,从库复制中如何有慢sql也将被记录

log_slow_slave_statements = 1

  1. 慢查询执行的秒数，必须达到此值可被记录

long_query_time = 8

  1. 检索的行数必须达到此值才可被记为慢查询

min_examined_row_limit = 100

  1. mysql binlog日志文件保存的过期时间，过期后自动删除

expire_logs_days = 5 


[client]
port	= 3306
socket	= /data/mysql/mysql.sock

[mysql]
prompt="\u@mysqldb \R:\m:\s [\d]> "
no-auto-rehash

[mysqld]
user	= mysql
port	= 3306
basedir	= /usr/local/mysql
datadir	= /data/mysql
socket	= /data/mysql/mysql.sock
pid-file = mysqldb.pid
character-set-server = utf8mb4
skip_name_resolve = 1

#若你的MySQL数据库主要运行在境外，请务必根据实际情况调整本参数
default_time_zone = "+8:00"

open_files_limit    = 65535
back_log = 1024
max_connections = 512
max_connect_errors = 1000000
table_open_cache = 1024
table_definition_cache = 1024
table_open_cache_instances = 64
thread_stack = 512K
external-locking = FALSE
max_allowed_packet = 32M
sort_buffer_size = 4M
join_buffer_size = 4M
thread_cache_size = 768
interactive_timeout = 600
wait_timeout = 600
tmp_table_size = 32M
max_heap_table_size = 32M
slow_query_log = 1
log_timestamps = SYSTEM
slow_query_log_file = /data/mysql/slow.log
log-error = /data/mysql/error.log
long_query_time = 0.1
log_queries_not_using_indexes =1
log_throttle_queries_not_using_indexes = 60
min_examined_row_limit = 100
log_slow_admin_statements = 1
log_slow_slave_statements = 1
server-id = 3306
log-bin = /data/mysql/mybinlog
sync_binlog = 1
binlog_cache_size = 4M
max_binlog_cache_size = 2G
max_binlog_size = 1G

#注意：MySQL 8.0开始，binlog_expire_logs_seconds选项也存在的话，会忽略expire_logs_days选项
expire_logs_days = 7

master_info_repository = TABLE
relay_log_info_repository = TABLE
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates
slave-rows-search-algorithms = 'INDEX_SCAN,HASH_SCAN'
binlog_format = row
binlog_checksum = 1
relay_log_recovery = 1
relay-log-purge = 1
key_buffer_size = 32M
read_buffer_size = 8M
read_rnd_buffer_size = 4M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1
lock_wait_timeout = 3600
explicit_defaults_for_timestamp = 1
innodb_thread_concurrency = 0
innodb_sync_spin_loops = 100
innodb_spin_wait_delay = 30

transaction_isolation = REPEATABLE-READ
#innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 22938M
innodb_buffer_pool_instances = 4
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
innodb_data_file_path = ibdata1:1G:autoextend
innodb_flush_log_at_trx_commit = 1
innodb_log_buffer_size = 32M
innodb_log_file_size = 2G
innodb_log_files_in_group = 2
innodb_max_undo_log_size = 4G
innodb_undo_directory = /data/mysql/undolog
innodb_undo_tablespaces = 95

# 根据您的服务器IOPS能力适当调整
# 一般配普通SSD盘的话，可以调整到 10000 - 20000
# 配置高端PCIe SSD卡的话，则可以调整的更高，比如 50000 - 80000
innodb_io_capacity = 4000
innodb_io_capacity_max = 8000
innodb_flush_sync = 0
innodb_flush_neighbors = 0
innodb_write_io_threads = 8
innodb_read_io_threads = 8
innodb_purge_threads = 4
innodb_page_cleaners = 4
innodb_open_files = 65535
innodb_max_dirty_pages_pct = 50
innodb_flush_method = O_DIRECT
innodb_lru_scan_depth = 4000
innodb_checksum_algorithm = crc32
innodb_lock_wait_timeout = 10
innodb_rollback_on_timeout = 1
innodb_print_all_deadlocks = 1
innodb_file_per_table = 1
innodb_online_alter_log_max_size = 4G
innodb_stats_on_metadata = 0
innodb_undo_log_truncate = 1

# some var for MySQL 5.7
innodb_checksums = 1
#innodb_file_format = Barracuda
#innodb_file_format_max = Barracuda
query_cache_size = 0
query_cache_type = 0
innodb_undo_logs = 128

#注意：MySQL 8.0.16开始删除该选项
internal_tmp_disk_storage_engine = InnoDB

innodb_status_file = 1
#注意: 开启 innodb_status_output & innodb_status_output_locks 后, 可能会导致log-error文件增长较快
innodb_status_output = 0
innodb_status_output_locks = 0

#performance_schema
performance_schema = 1
performance_schema_instrument = '%memory%=on'
performance_schema_instrument = '%lock%=on'

#innodb monitor
innodb_monitor_enable="module_innodb"
innodb_monitor_enable="module_server"
innodb_monitor_enable="module_dml"
innodb_monitor_enable="module_ddl"
innodb_monitor_enable="module_trx"
innodb_monitor_enable="module_os"
innodb_monitor_enable="module_purge"
innodb_monitor_enable="module_log"
innodb_monitor_enable="module_lock"
innodb_monitor_enable="module_buffer"
innodb_monitor_enable="module_index"
innodb_monitor_enable="module_ibuf_system"
innodb_monitor_enable="module_buffer_page"
innodb_monitor_enable="module_adaptive_hash"

[mysqldump]
quick
max_allowed_packet = 32M
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